MXS-1300: Fix test server creation

Before creating the users, the master will do a RESET MASTER to remove the
automatically generated binlogs. The servers should now start a lot faster
since they no longer need to replicate the large amounts of data that were
in these generated binlogs.

maxctrl/test/sql/master/users.sql

@@ -1,3 +1,4 @@
+RESET MASTER;
 CREATE DATABASE test;
 
 CREATE USER 'maxuser'@'127.0.0.1' IDENTIFIED BY 'maxpwd';